JPH04299248A - Sensor for sulfurous acid detector - Google Patents

Abstract

PURPOSE:To obtain a sensor easy to handle which allows independent exchanging of a membrane and a battery by providing a membrane holder which has a bio membrane retaining a sulfurous acid oxidation bacteria interposed between an oxygen detector and a measuring chamber forming body. CONSTITUTION:A sensor 200 has a cylindrical housing 1, an oxygen detector 2 connected thereto, a measuring chamber forming body 3 for forming a measuring chamber of a liquid to be measured and a membrane holder 4 for having a bio membrane retaining sulfurous acid oxidation bacteria between the oxygen detector 2 and the measuring chamber forming body 3. The housing 1 comprises a large-diameter cylindrical measuring chamber housing 12 and a long cylindrical sensor housing 13 and a flange 11 is screwed detachably on a case 100 to fix. The oxygen detector 2 has a cylindrical oxygen battery 6 mounted detachably at one end part thereof. The oxygen detector 2 has a handle 21 which is cylindrical and larger in the inner diameter at one end part thereof and the other end part of the battery 6 is inserted thereinto.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates primarily to a sensor for an apparatus for measuring sulfite concentration in food liquids.

0002

[Prior Art] In order to measure the concentration of sulfites such as antioxidants contained in food liquids, bacteria or enzymes that oxidize sulfites (hereinafter referred to as bacteria) are used, and the bacteria are assimilated by the oxidation reaction. A method has been proposed in which the concentration of dissolved oxygen in a solution of food or the like is detected and the concentration of sulfite is calculated from the detected dissolved oxygen concentration. (For example, Japanese Patent Application Hei 2-2
71860)

[0003] In addition, the sensor of the conventional detection device using bacteria or bacteria and an oxygen concentration battery has a structure in which the tip of a cylindrical sensor body serves as the detection part, and the tip is wrapped with a gas permeable membrane. However, it was difficult to handle because it required skill to apply the membrane evenly, and it was necessary to remove the membrane after it had been applied evenly in order to replace the battery.

0004

SUMMARY OF THE INVENTION An object of the present invention is to provide a sensor for a sulfur dioxide detection device that allows the membrane and battery to be replaced independently and is easy to handle.

[0005]

[Means for Solving the Problems] A sensor for a sulfur dioxide detection device of the present invention includes: a cylindrical housing that is detachably attached to a case of the sulfur dioxide detection device; an oxygen detector that is detachably inserted into the housing; A measurement chamber for the liquid to be measured is attached to the housing facing the detection section of the oxygen detector, and a measurement chamber for the liquid to be measured is detachably attached to the oxygen detector and is arranged between the detection section and the measurement chamber. It consists of bacteria, an immobilized membrane that immobilizes the bacteria, and a biomembrane that is a stack of gas-permeable membranes.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a detection section of a sulfurous acid detection device according to an embodiment of the present invention, and FIG. 2 shows an enlarged main part thereof. A sensor 200 of the sulfur dioxide detection device of the present invention is attached to a box-like case 100 of the sulfur dioxide detection device. The sensor 200 includes a cylindrical housing 1 and a cylindrical housing 1.
The oxygen detector 2 is connected to the oxygen detector 2, the measurement chamber forming body 3 forming a measurement chamber for the liquid to be measured facing the detection part, and the sulfite oxidizing bacteria between the oxygen detector 2 and the measurement chamber forming body 3. It has a membrane holder 4 for interposing the retained biofilm.

The housing 1 includes an annular flange 11, a large-diameter cylindrical measurement chamber housing 12 protruding from one end (the right end in the figure) of the flange, and the other end of the flange (the left end in the figure).
It consists of a long cylindrical sensor housing 13 that protrudes from the surface, and a flange 11 is removably screwed and fixed to the case 100. Sensor housing 13
An oxygen detector 2 is removably fitted into the measurement chamber housing 12, a measurement chamber forming body 3 is fitted and fastened to the measurement chamber housing 12, and a stirring device 5 is fastened to the end face of the measurement chamber housing 12. .

[0008] The oxygen detector 2 has a cylindrical oxygen battery 6 removably attached to one end thereof. The battery 6 has a flat spherical surface 61 at one end, an oxygen electrode surface at the center, and a rod-shaped electrode terminal 62 protruding from the other end. A flange 63 is provided around the outer periphery of the battery 6, O-rings 64 and 65 are fitted to one end, and an O-ring 66 is fitted to the other end.

The oxygen detector 2 has a cylindrical shape with a larger inner diameter at one end, and has a handle 21 into which the other end of the battery 6 is fitted. Inside the handle 21 is housed an outlet 22 into which the electrode terminal 62 of the battery 6 is inserted, and a cable 23 is connected to the other end of the outlet 22. A cylindrical battery cap 24 is externally fitted and screwed onto one end side of the handle 21, and the battery cap 24 is fitted between an inner edge 25 provided at one end of the battery cap 24 and an end surface of the handle 21. A flange 63 is sandwiched and fixed. The outer periphery of one end side of the battery cap 24 has a slightly smaller diameter, and a screw 26 is formed therein.

The outer periphery of the handle 21 has an annular side wall, and a screw 27 extending from the outer periphery to one side (to the right in the figure) and screwing into the screw 14 formed on the outer periphery of the sensor housing 13 on the inner periphery. An annular housing cap 2 formed with
8 is loosely fitted, and the side wall is connected to the battery cap 24.
It is locked to the other end surface.

The biomembrane holder 4 consists of a cylindrical biomembrane cap 41, a biomembrane 40 stretched over one end surface of the biomembrane cap 41, and a holding ring 42 for the membrane. The biofilm 40 is formed by laminating sulfite-oxidizing bacteria B, an immobilized membrane on which the bacteria are immobilized, and a gas permeable membrane. The biomembrane cap 41 is
a large-diameter threaded portion 43 that is externally fitted onto one end side of the battery cap 24 and is screwed into the screw 26; and a small-diameter portion 44 that is connected in series with the tip of the battery cap 24;
It consists of an intermediate side wall portion 45 that connects these.

The biomembrane 40 is held by a presser ring 42 that is fitted onto the small diameter portion 44 and holds the outer circumferential portion of the membrane 40 between the outer circumferential surface of the small diameter portion 44. This membrane 4
0, the center part is glued to the end face of the small diameter part 44, the outer peripheral part is glued to the outer periphery of the small diameter part 44, and when the presser ring 42 is fitted onto the small diameter part 44 in this state, the membrane The outer periphery of the membrane 40 is sandwiched between the ring 42 and the small diameter portion 44, and an even tension can be applied to the center of the membrane 40 when it is fitted.

The inner peripheral wall of the small-diameter portion 44 of the biomembrane cap surrounds the outer peripheral wall of one end side of the battery 6, and the gap is kept airtight by O-rings 64 and 65 fitted around the battery 6. ing. Further, the spherical surface 61 of the battery has a small diameter portion 44.
The center of the membrane 40 is in close contact with the oxygen electrode 60 of the battery. The immobilized membrane in the membrane 40 is formed into a bag shape, and bacteria B that uses sulfite as an energy source are sealed inside.

The measurement chamber forming body 3 includes an annular plate-shaped holding frame 31 which is open at the center and has a circular diameter window 30, and the window 30.
A truncated cone-shaped container 32 attached to the
, an inlet 33 for the liquid to be measured protruding from the lower conical surface of the container, and an outlet 34 for the liquid to be measured protruding from the upper conical surface of the container. A V-shaped O-ring groove 35 is formed at the edge of the window 30 and is inclined toward the other end, into which an O-ring 36 is fitted. This O-ring 36 protrudes somewhat from the other end surface of the holding frame 31 toward the other end, and presses against the spherical surface 61 at one end of the battery to seal the joint surface.

The stirring device 5 has a magnet rotating shaft driven by the motor 51 in the center of a cylindrical case 52 having a motor 51 fixed to one end and the other end fastened to the end face of the measurement chamber housing 12. 53 and rotates a stirrer 54 placed inside the container 32.

Next, the sulfur dioxide detection device and sensor 200
Explain how to handle. As shown in FIG. 3, inside the case 100 of the sulfur dioxide detection device, the detection section, the transfer pump 10
1, a three-way valve 102, and various control devices 103 including a control circuit are installed. Further, the measurement chamber includes an inlet 3
3, the liquid to be measured in the sample bottle 104 or the buffer in the buffer bottle 105 is selectively supplied via the three-way valve 102 and drained from the outlet 34 into the drain bottle 106.

In the work of detecting the sulfite concentration, the sulfite oxidizing bacteria B and the oxygen battery 6 are consumables and need to be replaced at any time. In the present invention, by twisting the housing cap 28 and removing it from the sensor housing 1, the oxygen detector 2 to which the gas permeable membrane holder 4 is screwed can be easily removed.

The membrane 40 and the bacteria retained on the membrane 40 are
It can be done with one touch by pushing off the holding ring 42, and also when installing a new biomembrane 40, the membrane 40
By covering the small diameter portion 44 of the biomembrane cap and fitting the presser ring 42, it is possible to tension the biomembrane cap with uniform tension. Note that if the membrane 40 is stretched unevenly, the adhesion with the oxygen electrode 60 of the oxygen battery will be poor, and detection accuracy will be reduced.

To replace the oxygen battery 6, remove the biomembrane cap 41 of the gas-permeable membrane holder, then remove the battery cap 24, and pull out the battery 6 from the outlet to replace the stretched membrane. It can be done easily without any hassle.

[0020]

[Effect of the invention] The sensor of the sulfur dioxide detection device of this invention has the following features:
The biomembrane 40 can be easily replaced, and the battery 6 can be replaced independently of the membrane replacement. These make it easy to handle.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a sensor mounting portion of a sulfur dioxide detection device.

FIG. 2 is an enlarged view of the main part of FIG. 1;

FIG. 3 is a schematic diagram of a sulfurous acid detection device.

[Explanation of symbols]

100 Case of sulfite detection device 200 Sulfur dioxide detection device sensor 1 Housing 2 Oxygen detector 3 Measurement chamber forming body 4 Biomembrane holder 5 Stirring device 6 Oxygen battery 40 Bio membrane

Claims (5)

[Claims] 1. A cylindrical housing that is removably attached to a case of a sulfur dioxide detection device, an oxygen detector that is removably inserted into the housing, and an oxygen detector that is attached to the housing facing the detection section of the oxygen detector. a measurement chamber for the liquid to be measured, which is removably attached to the oxygen detector and arranged between the detection section and the measurement chamber, and a sulfite-oxidizing bacteria,
A sensor for a sulfite detection device comprising an immobilized membrane on which the bacteria are immobilized, and a biomembrane on which a gas permeable membrane is laminated. 2. A sensor for a sulfur dioxide detection device according to claim 1, wherein the oxygen detector comprises a handle housing an outlet therein, and an oxygen battery removably fitted into one end of the handle. 3. In claim 2, the biomembrane is configured as a membrane holder in which a biomembrane holding sulfite-oxidizing bacteria is stretched over an end face of a cylindrical biomembrane cap, and the cap is attached to the oxygen detector. The sensor of the sulfur dioxide detection device is fitted and screwed onto one end. 4. In claim 3, the biofilm is stretched over the end surface of the cylindrical biomembrane cap, and the periphery is placed between the outer periphery of the cap and the inner periphery of the presser ring by a presser ring fitted onto the cap. A sensor for a sulfur dioxide detection device that is mounted in a sandwiched manner. 5. In claim 3, the oxygen cell has one end serving as a detection portion having a flat spherical surface, an oxygen electrode formed in the center thereof, and a window having a circular diameter formed in the measurement chamber. An O-ring groove inclined toward the oxygen battery side is provided on the window edge, and an O-ring is fitted into the O-ring groove with an end surface protruding toward the battery side, and one spherical end of the oxygen battery is connected to the oxygen battery through the biofilm. The sensor of the sulfur dioxide detection device is pressed into contact with the O-ring.